Native Bread by Piatro Hlebka starts as follows:
The fire burns. Round the trench is massing
For home yearn our countrymen,
And the partisan young lasses
Bake and dry flat loaves again.
May that bread be blessed ever,
Bread which in the field they make,
Bread unsalted, bread unleavened,
For our weighty needing baked.
Why is this referred to as "unleavened bread"? Is this is a reference to the Passover story?
Edit: As I understand it, this poem was set during World War 2 and is told from the perspective of a Belarusian soldier.